On 16/09/2020 21:29, Josef Bacik wrote: > On 9/16/20 3:18 PM, Eugene Syromiatnikov wrote: >> On Wed, Sep 16, 2020 at 03:04:45PM -0400, Josef Bacik wrote: >>> At the time we tied the fs blocksize to the >>> page size, because it was unlikely that a user would mkfs a fs on one >>> arch >>> and move it over to another arch. >> >> But one doesn't need "another arch" for page size to change; many >> architectures (arm, mips, powerpc, sparc, to name a few) support multiple >> page sizes. > > Sure, but again you are not likely to change page size for an existing > system. The decision early on was to forgo this particular ability for > simplicity, and then we would revisit the decision later on. It's been > a while and there's still not been enough demand to justify the work > until recently. Thanks, This is messy but important Is it possible for Fedora to offer two flavours of the kernel package, like Debian? There, I created a -4k flavour so it builds two kernel packages, one with 4k and the other with 64k. They can both be installed on the same machine and one or the other selected in the grub menu on each boot. Either can mount an ext4 root but obviously they can't share the same btrfs root, only the one that created it can mount that root. Once an alternative kernel is available, people need an installer/rescue ISO including that kernel. This may mean making both permutations available as different installer ISOs, or including two kernels in the same ppc64el Installer logic: If somebody is using ANY non-4k page size, on any architecture, it would be useful to display a pop-up window with a warning about btrfs before they create their root filesystem. This will save a lot of trouble for people. They might not realize there is a problem until they've been using the system for a few days and then they have to reinstall it again. Finally, if both page sizes are available, it is desirable to do a build of every package for every page size. Some packages appear to sense the page size at compile time and assume it will always be the same at runtime. This is unfortunate. Maybe reproducible builds techniques can be used to build each package on two different page sizes, detect if the binary differs and if so, suggest checking for hard-coded page size. Regards, Daniel _______________________________________________ devel mailing list -- devel@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to devel-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/devel@xxxxxxxxxxxxxxxxxxxxxxx
